It might not be advisable to use language specific translations files from the ZIP. It is better to start off with english.po, as mentioned in the instructions. The language specific translation files such as french.po & dutch.po are auto-generated.

I have attached the PlugAdmin English.po files. As far using the auto-generated PO files other than English might not have all the strings needs for translations. It is recommended to English.po for a complete translation.

Since it's almost midnight here, and I'm beat after 12h of work, and also tomorrow I have a day off, so I'll start as soon as I get up. But I'd like to announce that Polish translation should be ready very soon.